YUP i do here. i know some don't though but i do because majority of places around me charge for those days and also go by the ISD in town.
I would check to see what local providers do around you, center or otherwise and go with the majority so if the parents question you at interview you can back it up and say that, HEY its a common policy in our area
Plus, I'm a business. If i gave the parents every sick day, weather day, holiday, not paid, i wouldn't be a business, i wouldn't be making money, id be stressing myself out working 10.5 hours a day for more of a hobby that anything. thats just how i see it.
